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J Vet Sci 2018; 19(2): 290-295  https://doi.org/10.4142/jvs.2018.19.2.290
Optimization of scan delay for multi-phase computed tomography by using bolus tracking in normal canine kidney
Hyun Cho1, Da-Hae Lee1, Ah-Young Cha1, Dong-Eun Kim1, Dong-Woo Chang2, Jihye Choi1,*
1College of Veterinary Medicine, Chonnam National University, Gwangju 61186, Korea
2College of Veterinary Medicine, Chungbuk National University, Cheongju 28644, Korea
Correspondence to: Tel: +82-62-530-2821; Fax: +82-62-530-2809; E-mail: imsono@chonnam.ac.kr
Received: April 5, 2017; Revised: August 4, 2017; Accepted: September 22, 2017; Published online: March 31, 2018.
This study was performed to optimize scan delays for canine kidney by using a bolus-tracking technique. In six beagle dogs, computed tomography (CT) of the kidney was performed three times in each dog with different scan delays after a bolus-tracking trigger of 100 Hounsfield units (HU) of aortic enhancement. Delays were 5, 20, 35, and 50 sec for the first scan, 10, 25, 40, and 55 sec for the second scan, and 15, 30, 45, and 60 sec for the third scan. The renal artery-to-vein contrast difference peaked at 5 sec, and the renal cortex-to-medulla contrast difference peaked at 10 sec. The renal cortex-to-medulla contrast difference approached zero at a scan delay of 30 sec after the bolus trigger. For the injection protocol used in this study, the optimal scan delay times for renal arterial, corticomedullary, and nephrographic phases were 5, 10, and 30 sec after triggering at 100 HU of aortic enhancement using the bolus-tracking technique. The bolus-tracking technique is useful in multi-phase renal CT study as it compensates for different transit times to the kidney among different animals, requires a small dose of contrast media, and does not require additional patient radiation exposure.
Keywords: bolus tracking, computed tomography, dogs, kidney, scan delay

© 2018 The Korean Society of Veterinary Science.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.